var Screen = function Screen() {
    //如果不能new  要抛出一个错误
    throw new TypeError("Illegal constructor");
}//构造函数
catvm.safefunction(Screen); //tostring 保护
//设置原型链上显示的名字***************************************************************************
Object.defineProperties(Screen.prototype, {
    [Symbol.toStringTag]: {
        value: "Screen",
        configurable: true
    }
});
// 原型指向原型父亲***************************************************************************
screen={};
screen.colorDepth=24
screen.pixelDepth=24
screen.__proto__ = Screen.prototype
//该环境下的属性和方法***************************************************************************


//代理***************************************************************************
screen=catvm.proxy(screen)

